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“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

thanks, yes i see the PCB trace it is connected. this is look almost like the PSU i mentioned on my other thread, the difference is this PSU only use 1 transformer with 2x25v secondary rail, and use 2xDiode rectifier. Could this also be implemented with 2 transformer?

That's the beauty of twin secondary windings, they are isolated from each other. Separating the transformers simply follows the same isolation. Unfortunately twin transformers also increases the regulation unless you choose very large transformers which have lower regulation.

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regards Andrew T.
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Q. What kind of improvement do we get by adding an extra power supply?
A. By adding another power supply, you make it into a complete mono structure. It also adds more power (does not double though) and current capacity. The result is an airier, deeper soundstage and more authotity through the entire frequency range.

__________________www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

__________________www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

Lets start with a transformer. I use Plitron 300VA, 2 x 22V AC in all my amps, both stereo and dual mono. It is is approx $100 for a single unit. Getting similar Avel transformer from Partsexpress will cost you $50/pc.

If I order custom transformers, I prefer secondary at the core with wire diameter 1.8mm (for 300VA unit). I tested some amorphous core custom transformers and they sounded marginally better than standard core.

__________________www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

If your transformer comes with a standard mounting hardware, that's what you use.

Plitrons are epoxy filled and hardware is not included. I increase the hole to 3/8" size and install ancor nut with a matching screw, available from Home Depot. The screw hole size, in a bottom of a chassis, is 1/4".

__________________www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC